A polyamide A-3 flat belt 6 in wide is used to transmit 15 hp under light shock conditions where K_{s}=1.25, and a factor of safety equal to or greater than 1.1 is appropriate. The pulley rotational axes are parallel and in the horizontal plane. The shafts are 8 ft apart. The 6-in driving pulley rotates at 1750 rev/min in such a way that the loose side is on top. The driven pulley is 18 in in diameter. See Fig. 17–10. The factor of safety is for unquantifiable exigencies.
(a) Estimate the centrifugal tension F_{c} and the torque T.
(b) Estimate the allowable F_{1}, F_{2}, F_{i} and allowable power H _{a} .
(c) Estimate the factor of safety. Is it satisfactory?